Question

A box contain 20 balls out of which 6 red , 5 black and rest are white one ball is drawn at random what is the probability that it is a white ball

Answer 1

Answer:

,red balls 6 ,black ball 5,rainbow color 1,white ?

white =5+6+1-20

=12-20

=8

Answer 2

Step-by-step explanation:

out of 20 balls 1 ball can be drawn in 20C1 ways

20C1=20;so n(S)=20

now,we have to choose 1 white ball

out of 9 white ball 1 ball can be drawn in 9C1 ways 9C1=9;so we can write n(E)=9

Now probablity of event=n(E)/n(S)=9/20

so the answer will be 9/20.

hope it will help you.....